From the following list, identify which two are effective supply side levers for improving activation rates in an e-commerce marketplace:
- Lever I: Developing a comprehensive customer service training program for all employees.
- Lever II: Offering a diverse range of products to cater to different customer interests and needs.
- Lever III: Implementing an advanced search engine optimization (SEO) strategy for the marketplace website.
- Lever IV: Providing competitive pricing, including deals and discounts, on a wide variety of products.